So i downloaded lams 2.4, and run it! When i tried to import my lesson to the author panel, it failed!
Showing me this: org.hibernate.AssertionFailure null id in org.lamsfoundation.lams.learningdesign.ToolActivity entry (don't flush the Session after an exception occurs). Of course my lesson works on lessonslams.org .

I understand that, since i can't add an other teacher to my lesson while running the lesson on lessonlams.org and i can't import my lesson since is fails, i need to create again my lesson on lams 2.4 and send the lesson to the other professor so i can add him in the monitors list.

However i can't understand why i can't see in Lams 2.4 the lessons i have already created, by going My Groups --> Add Lesson and then choosing the right folder, since i'm using the same account with that on lessonlams.org